{"id":"CVE-2020-20691","aliases":["EUVD-2020-13476","GHSA-2648-mr6g-p443"],"status":"published","title":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via...","description":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafted HTML files.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00926,"percentile":0.60911,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-434"],"published":"2021-09-27T21:34:17Z","modified":"2026-10-20T10:52:08Z","products":[{"vendor":"monstra","product":"monstra_cms"}],"references":[{"url":"https://github.com/monstra-cms/monstra/issues/461","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-20691"},{"url":"https://github.com/advisories/GHSA-2648-mr6g-p443"}],"sources":{"cve":[{"id":"CVE-2020-20691","description":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafted HTML files.","status":"published","published":"2021-09-27T21:34:17Z","modified":"2024-08-04T14:22:25.257Z","updated_at":"2026-11-02T14:35:45.763329Z"}],"euvd":[{"id":"EUVD-2020-13476","description":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafted HTML files.","status":"published","published":"2021-09-27T21:34:17Z","modified":"2024-08-04T14:22:25Z","updated_at":"2026-11-03T03:07:24.233243Z"}],"ghsa":[{"id":"GHSA-2648-mr6g-p443","title":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via...","description":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafted HTML files.","status":"published","published":"2022-05-24T19:16:01Z","modified":"2023-01-30T05:02:21Z","cwes":["CWE-434"],"updated_at":"2026-11-02T14:46:37.149934Z"}],"nvd":[{"id":"CVE-2020-20691","description":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafted HTML files.","status":"published","published":"2021-09-27T22:15:07.477Z","modified":"2026-06-17T03:03:22.703Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:06:45.704484Z"}],"osv":[{"id":"CVE-2020-20691","description":"An issue in Monstra CMS v3.0.4 allows attackers to execute arbitrary web scripts or HTML via bypassing the file extension filter and uploading crafted HTML files.","status":"published","published":"2021-09-27T22:15:07.477Z","modified":"2026-10-20T10:52:08.573953507Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:15.212689Z"}]}}